Fig. 5. The MAP:total protein ratio (%) is higher in the seminal fluid than in the spermatogenic tubule (ST) luminal fluid. Representative scan profiles of the Coomassie-stained proteinograms after SDS-PAGE. The protein loading for each lane is indicated. (A) Seminal fluid (1.5 µg). (B) Luminal fluid of the longitudinal gonadal duct (2.5 µg). (C) Luminal fluid of the STs (10 µg). (D) Extract from the whole gonad/mantle (10 µg). Dotted lines indicate the MAP fractions, 39 kDa.